POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS1000W
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS213400 E01
REV.
J
LANG.
en
PAGE
In addition, an external thermal protection device can be connected to a digital
input. As soon as the temperature of the braking resistors exceeds the response
threshold of the external thermal protection device, the operation of the braking
chopper is disabled and an alarm message is displayed on the control panel of the
ACS1000W. Braking is then only possible when the temperature falls below the
threshold.
3.4.7.3. External cooling for braking resistors
A digital output and a digital input can be used to control and monitor an external
cooling fan or pump for the braking resistors.
3.4.7.4. Braking chopper ratings
The maximum braking power is limited to 60% of the nominal power of the
ACS1000W and must not be greater than 2.5 MW (Table 3
1).
The relation between maximum braking energy (E
brake max
) and maximum chopper
braking power (P
chopper max
) is as follows:
(1)
After a braking period of 30 s with maximum braking power (2.5 MW), a cooling
time of one hour is required. If two braking sequences of 30 s are necessary within
an hour, the maximum braking power has to be reduced to 50% of the maximum
possible braking power.
Table 3
-
1 Braking ratings
ACS1000W
Braking chopper
Type
Max. DC-link
voltage (V)
Max. braking
power (MW)
Max. braking
power (MW)
Max. braking
energy (MW)
ACS1012-A1
ACS 1013-A1
ACS 1014-A1
4200
6000
7270
0.426
0.426
0.426
2500
75
ACS1012-A2
ACS 1013-A2
ACS 1014-A2
4200
6000
7270
0.672
0.672
0.840
2500
75
ACS1012-A3
ACS 1013-A3
ACS 1014-A3
4200
6000
7270
0.960
1.080
0.960
2500
75
ACS1012-W1
ACS 1013-W1
ACS 1014-W1
4200
6000
7270
1.350
1.500
1.350
2500
75
ACS1012-W2
ACS 1013-W2
ACS 1014-W2
4200
6000
7270
1.680
2.130
2.130
2500
75
ACS 1013-W3
ACS 1014-W3
6000
7270
2.500
2.500
2500
75
E
brake max
MWs
P
chopper max
MW
30 sec
=